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I've searched a lot for the design of the sms queue and the retry scheme of the SMSC and it looks like it's a secret :), nothing in Google ever mentioned about it.

Anyone knows how it works and how to design it? I'm looking for the methods and data structures used to make one.

user_iv
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This is probably due to different vendors and operators using totally different retry schemes. Keep in mind different vendors/platforms have different features and parameters implemented to handle their queues.

What exactly do you want to know?

I would start by reading the very few lines ETSI put up regarding SMS Retry (4.4 in TR 102 529 - V1.1.1) and relate that to the relevant specifications for SMS Delivery. Also, some vendors have put out general information about their parameters, eg. Symsoft and opensource Kannel/EasySMS.

Also find a patented retry algo from http://www.google.com/patents/US8055287.

Andy Thompson
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